Split string into multiple variables in Bash [duplicate]

Question

I have a string that gets generated below:

192.168.1.1,UPDOWN,Line protocol on Interface GigabitEthernet1/0/13, changed state to up

How can I take that string and make 2 variables out of it (using bash)?

For example I want

$ip=192.168.1.1 
$int=GigabitEthernet1/0/13

How is GigabitEthernet1/0/13 delimited? Whatever follows Interface<space>? — Michael Berkowski
– Michael Berkowski, Commented May 14, 2014 at 20:00

0x2b3bfa0 · Accepted Answer · 2014-05-15 07:48:11Z

51

Try this:

mystring="192.168.1.1,UPDOWN,Line protocol on Interface GigabitEthernet1/0/13, changed state to up"

IFS=',' read -a myarray <<< "$mystring"

echo "IP: ${myarray[0]}"
echo "STATUS: ${myarray[3]}"

In this script ${myarray[0]} refers to the first field in the comma-separated string, ${myarray[1]} refers to the second field in the comma-separated string, etc.

answered May 15, 2014 at 7:48

0x2b3bfa0

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Comments

damienfrancois · Accepted Answer · 2014-05-14 20:04:36Z

27

Use read with a custom field separator (IFS=,):

$ IFS=, read ip state int change <<< "192.168.1.1,UPDOWN,Line protocol on Interface GigabitEthernet1013, changed state to up"
$ echo $ip
192.168.1.1
$ echo ${int##*Interface}
GigabitEthernet1013

Make sure to enclose the string in quotes.

answered May 14, 2014 at 20:04

damienfrancois

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2 Comments

Inoperable Over a year ago

how do I split a string into one array variable?

damienfrancois Over a year ago

@Inoperable stackoverflow.com/questions/10586153/…

glenn jackman · Accepted Answer · 2014-05-14 20:13:08Z

8

@damienfrancois has the best answer. You can also use bash regex matching:

if [[ $string =~ ([^,]+).*"Interface "([^,]+) ]]; then 
    ip=${BASH_REMATCH[1]}
    int=${BASH_REMATCH[2]}
fi
echo $ip; echo $int

192.168.1.1
GigabitEthernet1/0/13

With bash regexes, any literal text can be quoted (must be, if there's whitespace), but the regex metachars must not be quoted.

answered May 14, 2014 at 20:13

glenn jackman

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1 Comment

chepner Over a year ago

I'll point out here what I said in my now-deleted redundant answer: a regular expression may not be that much better than string splitting in this case, but can be useful for other problems.

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